Spatial separation of cavitating bubble populations: The nanodroplet injection model

Hangxun Xu, Nathan C. Eddingsaas, Kenneth S. Suslick

Research output: Contribution to journalArticle

Abstract

Intense Na* emission was observed from 0.1 M Na 2SO 4 in 95% sulfuric acid during multibubble sonoluminescence (MBSL). As a function of acoustic intensity, three different morphologies are observed for the cloud of light emitting bubbles. Even more strikingly, there is a spatial separation between blue-white emitting bubbles and orange emitting bubbles, easily observed by the naked eye. Surprisingly, no Na* emission was observed on the top of a bubble cloud (blue-white emission) while strong Na* emission predominates at the bottom. This observation provides the first experimental evidence to distinguish between the two types of two-site models of acoustic cavitation and MBSL: spatial separation of emission from nonvolatiles (e.g., Na*) ought not to be observed for the heated-shell model but is predicted from the injected droplet model.

Original languageEnglish (US)
Pages (from-to)6060-6061
Number of pages2
JournalJournal of the American Chemical Society
Volume131
Issue number17
DOIs
StatePublished - May 6 2009

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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